Green Day drummer Tré Cool was a total party animal at Greenhouse the other night. Witnesses report Cool arrived at the Varick Street hot spot with “one of the club’s hot Asian cocktail waitresses who had the day off” and then poured multiple shots of Patrón for delighted patrons. He later danced suggestively against a wall with his date and “flirted with both guys and girls at the club, joking that he was bisexual.”